The premise of the Work Group's report A Proposed Licensing Model for User-Managed Access is that UMA enables the individual to centrally manage access and use rights with respect to personal digital assets by converting permission tokens into machine-readable licenses. The group is working on a companion document that outlines a larger business-legal framework for achieving a wide variety of rights delegation use cases involving UMA technology.
Here are the UMA Grant (PDF, HTML for deep linking) and UMA Federated Authorization Recommendations (PDF, HTML for deep linking). Don't miss the UMA2 masterclass delivered by two UMAnitarians at the Identiverse conference in Boston in June 2018 (slides and video). (The slides and video from the previous year's Authorization: Age of UMA session set in the Marvel Cinematic Universe was also a big hit!) The Release Notes review all final UMA1-to-UMA2 changes. See also the UMA Implementer's Guide, our list of known Implementations, and discussions of Case Studies. Finally, see the detailed UMA Grant sequence diagram and FedAuthz sequence diagram.